95 ZR1 Oil Leak Question - ZR-1 Net Registry Forums

KJL · 03-21-2013

I just purchased a 95 ZR1. I noticed some oil pooling in the narrow pockets in between the intake and valve cover. I am fairly sure the oil is not coming from the valve covers but looks to be coming from the area where the lower intake runners mate with the intake manifold. I cleaned all the oil out and only running the car to warm it up seems to be enough where more oil is finding its way there. To replace this gasket looks like a major PITA. Is this a common problem?

Does anyone know of a person in the Atlanta GA area that is familiar with these cars that does good work?

Thanks.

Ronstar · 03-21-2013

There is a rubber grommet on the side of injector housing just below intake runners near rear of motor on both sides. These are prone to let a little oil seep past if installed incorrectly or just age. Standard grommet available at most auto parts stores or I'm sure Jerry has them

KJL · 03-21-2013

Thanks, this leak is on the side of the engine. I wish I could post a picture of it.

Ronstar · 03-21-2013

That's what I'm saying. Side of engine just above "valve covers" just below "intake runners". Oil will run down and pool up in crevice at base of injector housing

KJL · 03-21-2013

OK, I will check those but this in at the mid-point of the engine. I am curious why oil would be coming out of the intake runner gasket area regardless, if that is where it is coming from. Maybe it is coming from the valve cover and traveling along the edge.

Ronstar · 03-21-2013

If you look closely you will see that top portion of the intake runners (plenum) goes downward and connects to the "lower runners" this is the injector housing. The black grommet comes out the side of the injector housing on each side of engine. These are prone to leak and I would bet that is your problem.
Hard to explain without pics but the lower portion of injector housing is open to crankcase to help with crankcase ventilation and oil IS present there.
Maybe someone smarter than me can post pics of what I am trying to describe.

Or call me. 810-625-0948. I can send pics from my phone

cvette98pacecar · 03-21-2013

Ron, I saw your name. I was going to tell you bring her over when the weather breaks and we will put her up on the lift.
If you do not have a lift and you want to inspect the entire undercarriage and tighten everything up before the Trip to BG lets plan on the first weekend in May.

Ronstar · 03-21-2013

I'd really appreciate that!...if the weather ever breaks

KJL · 03-22-2013

Are these the grommets you are referring too? I checked them but maybe not close enough. It would seem to me that the gasketed areas should be "sucking" not "blowing" regardless. Hmmmm.

To upload a pic you need to press the "Post Reply" button at the top of the original message. Then goto "Manage Attachments", browse and upload. I converted my pic to a 600dpi pdf.

Thanks for your help.

Ronstar · 03-22-2013

Those are the ones. The lower "chamber" in the injector housing is seperated from the intake runners. It is open to crankcase below. Definitely sees oil and pressure. Had this problem on mine,although it didn't look like the grommets were bad. Oil would pool up in the little crevice below there and above the cam covers. Put in new grommets and no more oil. If that is where your oil is collecting it almost has to be those grommets. Unless the cam cover is leaking which would be unlikely

03-21-2013	#1
KJL Join Date: Mar 2013 Location: Roswell, GA Posts: 234	95 ZR1 Oil Leak Question I just purchased a 95 ZR1. I noticed some oil pooling in the narrow pockets in between the intake and valve cover. I am fairly sure the oil is not coming from the valve covers but looks to be coming from the area where the lower intake runners mate with the intake manifold. I cleaned all the oil out and only running the car to warm it up seems to be enough where more oil is finding its way there. To replace this gasket looks like a major PITA. Is this a common problem? Does anyone know of a person in the Atlanta GA area that is familiar with these cars that does good work? Thanks.

03-21-2013	#2
Ronstar Join Date: Jul 2012 Location: Michigan Posts: 182	Re: 95 ZR1 Oil Leak Question There is a rubber grommet on the side of injector housing just below intake runners near rear of motor on both sides. These are prone to let a little oil seep past if installed incorrectly or just age. Standard grommet available at most auto parts stores or I'm sure Jerry has them

03-21-2013	#3
KJL Join Date: Mar 2013 Location: Roswell, GA Posts: 234	Re: 95 ZR1 Oil Leak Question Thanks, this leak is on the side of the engine. I wish I could post a picture of it. __________________ 1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp

03-21-2013	#4
Ronstar Join Date: Jul 2012 Location: Michigan Posts: 182	Re: 95 ZR1 Oil Leak Question That's what I'm saying. Side of engine just above "valve covers" just below "intake runners". Oil will run down and pool up in crevice at base of injector housing

03-21-2013	#5
KJL Join Date: Mar 2013 Location: Roswell, GA Posts: 234	Re: 95 ZR1 Oil Leak Question OK, I will check those but this in at the mid-point of the engine. I am curious why oil would be coming out of the intake runner gasket area regardless, if that is where it is coming from. Maybe it is coming from the valve cover and traveling along the edge. __________________ 1995 ZR1 #159 Ported,Corsa,4.10 Rear, Dual Disc RAM Clutch, Alum Flywheel, Haibeck Chip, ZFDoc Plates, Relocated Battery 400 rwhp 1992 ZR1 #280 Ported, Locked Secondary's, Flowmaster Exhaust, Haibeck Chip, 375rwhp 1996 Collectors LT4 (Stock) 1972 Convertible 434 Small Block 572 rwhp

03-21-2013	#6
Ronstar Join Date: Jul 2012 Location: Michigan Posts: 182	Re: 95 ZR1 Oil Leak Question If you look closely you will see that top portion of the intake runners (plenum) goes downward and connects to the "lower runners" this is the injector housing. The black grommet comes out the side of the injector housing on each side of engine. These are prone to leak and I would bet that is your problem. Hard to explain without pics but the lower portion of injector housing is open to crankcase to help with crankcase ventilation and oil IS present there. Maybe someone smarter than me can post pics of what I am trying to describe. Or call me. 810-625-0948. I can send pics from my phone

03-21-2013	#7
cvette98pacecar Join Date: May 2011 Location: Sydney, Australia Posts: 2,466	Re: 95 ZR1 Oil Leak Question Ron, I saw your name. I was going to tell you bring her over when the weather breaks and we will put her up on the lift. If you do not have a lift and you want to inspect the entire undercarriage and tighten everything up before the Trip to BG lets plan on the first weekend in May.

03-21-2013	#8
Ronstar Join Date: Jul 2012 Location: Michigan Posts: 182	Re: 95 ZR1 Oil Leak Question I'd really appreciate that!...if the weather ever breaks

03-22-2013	#10
Ronstar Join Date: Jul 2012 Location: Michigan Posts: 182	Re: 95 ZR1 Oil Leak Question Those are the ones. The lower "chamber" in the injector housing is seperated from the intake runners. It is open to crankcase below. Definitely sees oil and pressure. Had this problem on mine,although it didn't look like the grommets were bad. Oil would pool up in the little crevice below there and above the cam covers. Put in new grommets and no more oil. If that is where your oil is collecting it almost has to be those grommets. Unless the cam cover is leaking which would be unlikely

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